Novel antibacterial agents consisting of a 2,3,5,8-tetrahydro-5-alkoxy-8-oxofuro(2,3-g)quinoline-7-carboxylic acid of the formula: ##STR1## wherein R is C.sub.1 -C.sub.4 alkyl, a process for producing the derivatives and pharmaceutical compositions containing the same. The above-identified derivatives possess antibacterial activity against gram-negative bacteria at test concentration levels of about 0.0001 to 1.0 mg/cc.
新型抗菌剂包括公式为:##STR1## 其中R为C.sub.1-C.sub.4烷基的2,3,5,8-四氢-5-烷氧基-8-氧代
呋喃(2,3-g)
喹啉-7-
羧酸衍
生物,制备该衍
生物的方法以及含有该衍
生物的药物组合物。以上所述的衍
生物在测试浓度为0.0001到1.0毫克/立方厘米时对革兰氏阴性菌具有抗菌活性。